The Macworld Conference & Expo, Silicon Valley’s largest technology trade show, opens Monday. But the moment everyone is waiting for comes Tuesday morning, when Steve Jobs makes his annual keynote address at San Francisco’s Moscone Center.

Jobs has set a high bar for himself. At Macworld 2006, he introduced the first Intel (INTC)-based Macs — sparking a burst of sales that nearly doubled Apple’s (AAPL) market share from roughly 4% to something approaching 8% (link). At Macworld 2007 he unveiled not just the all-but-forgotten Apple TV, but also the iPhone — a device that in nearly everybody’s book turned out to be the machine of the year.

What can Jobs do to top that?

There’s no shortage of speculation. The Apple rumor machinery has grown so elaborate that for the second year in a row, Ars Technica’s John Siracusa has published a keynote Bingo card (available in PDF format here and in iPhone format here), with boxes to be filled in as Jobs makes his announcements, introduces his guests and trots out his trademark rhetorical flourishes. (The rules of the game are spelled out here.)

Nobody has yet shouted out “Bingo!” in middle of a Steve Jobs presentation — a moment brilliantly anticipated in IBM’s buzzword Bingo TV ad (link) — but this could be the year.

Some of Siracusa’s boxes are obviously more important than others. A couple (Mac Pro and Xserve) were preemptively filled last week, and there are a few key possibilities that he missed. Watch especially for:

• A Skinny MacBook. Probably the leading candidate for Jobs’ one-more-thing moment, it’s already been named — Macbook air, thin, nano and mini — and imagined in PhotoShop (see here, for example) by bloggers who should know better. Likely specs: 12 to 13-inch. LED backlit screen, under 3 lbs., half as thick as today’s MacBooks, 32, 64 or even 128GB solid-state flash drive, priced around $1,600.
• iPhone updates. A bump in capacity from 8GB to 16GB and maybe 32GB is expected, as well as a preview of the software developers toolkit (SDK) promised for February; we might even get a few demos from developers, like EA, who were seeded with the SDK last fall. A 3G iPhone and a Newton-type tablet are reported to be in the works, but not yet ready for prime time.
• Movie rentals. This is the item Hollywood is following most closely. It’s been widely reported that Fox and Disney are likely to make movies available on iTunes for overnight rental (at $3 to $5 for 24 hours) or for purchase for roughly the price of a shrink-wrapped DVD. If, as rumored, Paramount, Lions Gate and Warner Bros join them, the flood of fresh video content could breath new life into the Apple TV. (The Associated Press reported Sunday that Netflix (NFLX), anticipating such a move by Apple, will offer unlimited monthly video streaming.)
• DRM-free Music. Having famously championed the cause with his February 2007 Thoughts on Music memo, it would be surprising — and disappointing — if Jobs did not use this opportunity to announce a significant expansion of the DRM-free offerings in the iTunes Store, especially after the last of the major labels announced last week that they were putting their music on Amazon.com (AMZN) without copy protection.
• Microsoft (MSFT) Office 2008. No surprises here, since the reviews are already in, but an excuse for what should be the most lavish after-hours party of the show.
• The Beatles. It’s about time. Just in case, Yoko Ono’s John Lennon Educational Tour Bus mobile recording studio is making the trip from its Las Vegas unveiling at the Consumer Electronics Show to be at Macworld. A few hours after Jobs’ speech, there’s a press reception in the bus that’s co-sponsored by Apple.

You already see the flashbulbs popping, right? But is it enough? Apple’s marketing machinery is like a shark that must keep swimming or die. Even if nearly every square on the Bingo card were to be filled on Tuesday, would Jobs have delivered the kind of innovation and buzz the faithful have come to expect?

And then there’s Wall Street to consider. Apple was the high-flying tech stock of year, its share prices having more than doubled in 2007. But as a CNNMoney headline put it on Friday, “What’ve you done for me lately?” The stock fell nearly 30 points over the last two weeks, which could be taken as a measure of traders’ uncertaintly. (Or it could just be a well-timed pause to set up the Macworld effect, the short-term bump tech share prices often enjoy after a Steve Jobs’ keynote.)

No matter how high the bar, Jupiter Research analyst Michael Gartenberg is confident that Jobs will clear it. “This is a company that thinks in terms of strategy,” he says. “Do I think they’ll deliver something as disruptive as the iPhone? No. You don’t achieve that kind of disruption every week; it would be tantamount to getting into a whole new industry. But somehow Jobs always manages to meet expectations, even if the expectations are different.”

To find out how different, tune in Tuesday for Fortune senior writer Jon Fortt live blogging from the keynote at fortune.com/bigtech, video coverage from CNNMoney.com and our post-keynote analysis here on Tuesday afternoon.

With less than two weeks to go before Steve Jobs’ Jan. 15 keynote, analyst Shaw Wu of American Technology Research offers his best guess for what Apple’s (AAPL) CEO might have up his sleeve at Macworld Expo 2008. In a note to clients issued this morning, Wu predicts:

• Blu-ray. Citing unnamed sources, Wu says that Apple will outline an HD strategy that backs Sony’s Blu-ray format over the HD-DVD standard favored by Microsoft. (Although Wu hedges his bets and suggests that Apple might also use a combo Blu-ray/HD-DVD drive.)
• Subnotebook. Wu says Apple will re-enter the subnotebook space (nothing new there) but adds that Jobs may call the new machine the MacBook mini or MacBook slim. Any preferences?
• Movie rentals. Wu points out that the digital movie rental deals expected to be announced at Macworld are a departure driven by necessity, and represent a new business model for Apple. “Whether these movies expire based on time and/or usage is unclear to us,” he writes, “But we do believe that rentals are a significant change in its philosophy.”
• Speed bumps and external HDD: In the category of smaller announcements, Wu is picking up potential news related to speed bumps and or capacity bumps in current Macs and iPhones, and an external HDD storage/dock/streaming device for the Airport Extreme and the new MacBook mini/slim.
• Apple TV. Wu sees two big shortcomings in the current product: 1. no way to connect directly to the Internet for TV and movie content and 2. lack of a TV tuner. “Our sources indicate that AAPL is working on fixing these weaknesses to make Apple TV a much stronger product,” he writes, later in 2008 or perhaps 2009, but not at Macworld 2008.
• 3G iPhone. Coming mid to second-half 2008 at a higher price point, Wu says, allowing Apple to reposition the current iPhone as a “more mainstream” product.

What does Apple (AAPL) have in store for Macworld? Four weeks before Steve Jobs’ Jan. 15 keynote, Piper Jaffray analyst Gene Munster has offered his best guess. The report to clients he issued today hews pretty closely to conventional wisdom, but provides a handful of new details.

• Macintosh: Munster expects that in addition to updates across the Mac line Jobs will introduce that long-awaited thin Mac with an 11″ to 13″ screen, 64 GB of NAND-based solid state memory and (maybe) a iPhone-like multitouch touchpad. Price: somewhere between the $1,099 MacBook and the $1,999 MacBook Pro.
• iPhone: Apple could up the storage to 16 GB while maintaining the $399 price point, but it’s too early for the 3G iPhone 2, says Munster. He now expects that phone in May or June 2008 (His earlier predictions had pegged it for sometime between Sept. and Nov.)
• iTunes: “We also expect Apple to announce new content partnerships with one or more movie studios, which may involve the launch of iTunes movie rentals,” Munster writes. “We believe there is a 50% chance the download service is announced at Macworld, and a 90% chance by mid 2008.”

Meanwhile, UBS analyst Ben Reitzes has issued a bullish report based on a survey of more than 30 stores in which his research team found Mac demand “outpacing prior expectations.”

“Even with prospects for a slowing economy,” he writes, “we believe Mac demand can keep going strong with new products that we have detected in the supply chain. Given higher margins for the ‘Mac ecosystem,’ including software - we are raising estimates.”

For more on the UBS report, see AppleInsider here.

The Apple (AAPL) rumor sites have been buzzing for months about the new thin MacBook they expect Steve Jobs to unveil Jan. 15 at Macworld Expo 2008. Now, with the company’s annual showcase for new products less than six weeks away, the talking heads of cable business news have started to pick up the scent.

Yesterday was CNBC’s Jim Goldman’s turn. In a breathless report that aired shortly after noon (video, text), he cited a source “with good connections” to Apple’s manufacturing partners and rattled off what 9to5Mac characterized as “the known knowns”:

• That Jobs is introducing a new ultrathin subnotebook at Macworld
• That the machine replaces the usual hard drive with flash memory
• That the device is 50% thinner than the thinnest MacBook
• That it will have a 12-inch screen and cost $1,500

Actually, that last “known” is in dispute. AppleInsider, quoting its own manufacturing sources, maintains that the machine will have a 13.3 inch display. And the $1,500 price point, while devoutly to be wished, seems too aggressive by half. As Ars Technica points out, solid-state hard drives come very dear; the 64 GB Samsung drive alone costs about $1,000 (link). There are a bunch of flash-based 64 GB subnotebooks on the market, and they start at $2,000.

CNBC’s Goldman had other Apple news: that the iPod touch is selling well and Apple is ramping up production (a known known), and that a 3G iPhone is coming out next year, as early as May or June (a known rumor, but don’t hold your breath for May/June delivery).

With three weeks left before the promised ship date of OS X Leopard, the long-awaited and much-delayed sixth major update of Apple’s (AAPL) flagship Macintosh operating system, Piper Jaffray’s Gene Munster is already calculating its impact on the company’s revenue stream.

In a note to clients issued this morning, Munster observes that OS X Tiger, Leopard’s predecessor, was also released at the end of the first month of a fiscal quarter (April 29, 2005 vs. Oct. 26, 2007). He writes:

At that time, the OS X installed base was 12 million and Tiger sales added $125 million to the quarter. The Mac OS X installed base is now approximately 23 million, so we expect Leopard to add approximately $240 million to the Dec. 2007 quarter. This assumes similar uptake rates to the Tiger launch, which saw 15% of the user base upgrade in just 6 weeks (eventually 66% of the user base upgraded to Tiger).

Looking ahead to the next Macworld, Steve Jobs’ favorite venue for announcing new products, Munster anticipates one of two possiblities:

• a multi-touch PDA slightly larger than an iPhone (which some are calling the new Newton)
• an ultra-portable Mac that’s smaller than the smallest MacBook (which AppleInsider has dubbed the ThinBook)

“If Apple launches a new product at MacWorld in January,” Munster writes, “we believe it will likely fall into one of these two categories.”